Micro LED Display Devices and Their Brightness Control Methods and Applications

Abstract

The application relates to a Micro LED display device and a brightness control method and application thereof. The Micro LED display device comprises a control circuit layer, an LED pixel and a detector; the detector is arranged in the LED pixel, and the control circuit layer is used for controlling the light-emitting brightness of the LED pixel. The detector is arranged in the LED pixel to collect the light-emitting condition of the LED pixel, so that the display device has pixel-level photoelectric feedback capability and adjustment capability at the hardware level, thereby enabling the display device to no longer rely on an external high-precision imaging device for one-time compensation, but to realize self-Demura through the built-in detector and the pixel circuit, and thus effectively cope with the brightness non-uniformity problem caused by manufacturing differences or long-term use aging, realize a continuous Demura function, and reduce the test and maintenance cost of the display device in the whole life cycle.

Description

Technical Field

[0001] This application relates to the field of display device technology, and in particular to a Micro LED display device and its brightness control method and application. Background Technology

[0002] In the field of display technology, Micro LED is considered an important development direction for next-generation display technology due to its advantages in luminous efficiency, response speed, reliability, and lifespan. However, its industrialization faces some challenges, among which display uniformity is one of the key issues. Mura refers to the brightness or color non-uniformity visible to the naked eye on a display screen. To solve this problem, the industry generally adopts Demura technology. Traditional Demura technology usually relies on an external high-resolution imaging colorimeter to scan and obtain the brightness and color data of each pixel. The algorithm calculates the compensation value and writes it into the driver chip, thereby canceling the non-uniformity caused by hardware manufacturing at the signal end. Essentially, it is a kind of ex-post software compensation based on external detection.

[0003] The characteristics of Micro LED displays pose challenges to traditional Demura processes: First, the tiny pixel size requires testing equipment with extremely high optical resolution and extremely low image distortion, resulting in high testing system costs. Second, the uniformity defects of Micro LED displays are dynamic. Micro LED devices experience performance degradation during operation due to factors such as materials and heat dissipation, and their brightness and current may show a significant decline trend. This means that a one-time Demura compensation at the factory cannot address the ongoing Demura issues that arise due to aging throughout the product's lifespan. Repeatedly relying on expensive external equipment for testing and correction is impractical for end users.

[0004] Therefore, existing external, one-time Demura compensation solutions are insufficient to meet the requirements of Micro LED display technology for display uniformity throughout its entire lifecycle. Summary of the Invention

[0005] The purpose of this application is to provide a built-in, actively compensated Micro LED display device and manufacturing method, which solves the problems of high testing costs and inability to continuously compensate for external Demura technology, enabling the display to complete uniformity correction on its own throughout its entire life cycle and reducing dependence on external testing equipment.

[0006] The purpose of this application is to achieve the following technical solution: This application provides a Micro LED display device, including a control circuit layer, LED pixels, and a detector; The LED pixel includes a first color light-emitting layer and a light-transmitting layer superimposed on the first color light-emitting layer; The detector includes a first color detector, which is disposed on the light-transmitting layer to collect the actual luminous intensity of the first color luminous layer. The control circuit layer is connected to the first color emitting layer and the first color detector. The control circuit layer is used to drive the first color emitting layer to emit light. In test mode, it determines whether the emitting condition of the first color emitting layer has reached the preset adjustment condition based on the actual emitting brightness collected by the first color detector, and maintains or adjusts the magnitude of the driving electrical signal applied to the first color emitting layer according to the judgment result.

[0007] In one embodiment, the LED pixel further includes a second color emitting layer located between the first color emitting layer and the control circuit layer. The detector further includes a second color detector located on the first color emitting layer to collect the actual luminous intensity of the second color emitting layer. Both the second color emitting layer and the second color detector are connected to the control circuit layer.

[0008] In one embodiment, the LED pixel further includes a third color emitting layer located between the second color emitting layer and the control circuit layer. The detector further includes a third color detector located on the second color emitting layer to collect the actual luminous intensity of the third color emitting layer. Both the third color emitting layer and the third color detector are connected to the control circuit layer.

[0009] In one embodiment, the projections of the first color detector, the second color detector, and the third color detector on the control circuit layer are staggered.

[0010] In one embodiment, the area of ​​the first color detector occupies 1%-10% of the area of ​​the light-transmitting layer; and / or, The area of ​​the second color detector is 1%-10% of the area of ​​the first color emitting layer; and / or, The area of ​​the third color detector accounts for 1%-10% of the area of ​​the second color emitting layer.

[0011] In one embodiment, the first color emitting layer, the second color emitting layer, and the third color emitting layer are respectively selected from one of a red light emitting layer, a green light emitting layer, and a blue light emitting layer, and the first color emitting layer, the second color emitting layer, and the third color emitting layer are displayed as different colors.

[0012] In one embodiment, the LED pixels are arranged in an array in the Micro LED display device.

[0013] This application also provides a brightness control method for a Micro LED display device, comprising the following steps: In test mode, the control circuit layer applies an initial drive signal to drive the LED pixels to emit light; The detector receives light and performs photoelectric conversion to generate and output the actual luminous intensity signal. The control circuit layer receives the actual luminous intensity signal output by the detector and determines whether the luminous status of the LED pixel meets the preset adjustment conditions based on the actual luminous intensity signal. For LED pixels that meet the preset adjustment conditions, the pixel circuit changes the magnitude of the driving electrical signal applied to the LED pixel so that the LED pixel no longer meets the preset adjustment conditions. For LED pixels that do not meet the preset adjustment conditions, the pixel circuit maintains the value of the driving electrical signal at the value of the initial driving electrical signal.

[0014] In one embodiment, the LED pixel includes a first color emissive layer, a second color emissive layer, and a third color emissive layer; the detector includes a first color detector, a second color detector, and a third color detector; and the brightness control method includes the following steps: In test mode, the control circuit layer applies initial driving signals to the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer respectively to drive them to emit light; The first color detector, the second color detector, and the third color detector respectively detect the actual luminous brightness signals of the first color luminous layer, the second color luminous layer, and the third color luminous layer; The control circuit layer determines whether the luminescence of the first color emitting layer, the second color emitting layer, and the third color emitting layer meets the preset adjustment conditions. The control circuit layer controls the driving electrical signals applied to the first color light-emitting layer, the second color light-emitting layer, and the third color light-emitting layer respectively, so that the first color light-emitting layer, the second color light-emitting layer, and the third color light-emitting layer do not meet the preset adjustment conditions.

[0015] This application also provides a display screen comprising at least two of the aforementioned Micro LED display devices.

[0016] Compared with the prior art, this application has the following beneficial effects: 1. The Micro LED display device provided in this application, by embedding detectors in the LED pixels to collect the light emission of the LED pixels, enables the display device to have pixel-level photoelectric feedback and adjustment capabilities at the hardware level. As a result, the display device no longer needs to rely on external high-precision imaging equipment for one-time compensation, but can achieve self-Demura through the built-in detectors and pixel circuits. This can effectively deal with the problem of uneven brightness caused by manufacturing differences or long-term aging, realize continuous Demura function, and reduce the testing and maintenance costs of the display device throughout its entire life cycle.

[0017] 2. The brightness control method for Micro LED display devices provided in this application achieves pixel-level demura of Micro LED display devices through the steps of acquisition-judgment-adjustment. The operation process is simple and convenient, does not rely on external high-precision imaging equipment, and can perform demura at any time according to the display status of the display device.

[0018] 3. The display screen provided in this application is spliced ​​together using display devices that can perform self-demonstration at the pixel level, which makes the display effect of the display screen adjustable, thereby extending its service life to a certain extent. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the Micro LED display device of this application; Figure 2 This is a schematic diagram of the structure of the Micro LED display device according to the first embodiment of this application; Figure 3 This is a signal transmission route diagram of a control method in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of the Micro LED display device according to the second embodiment of this application; Figure 5 This is a schematic diagram of the structure of a Micro LED display device according to the third embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 100, control circuit layer; 101, pixel circuit; 200, LED pixel; 210, light-transmitting layer; 220, first color light-emitting layer; 230, second color light-emitting layer; 240, third color light-emitting layer; 300, detector; 310, first color detector; 320, second color detector; 330, third color detector. Detailed Implementation

[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0022] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] As pointed out in the background art, traditional Demura compensation technology based on external imaging equipment has the problems of high testing costs and inability to continuously correct the dynamic non-uniformity caused by pixel aging during the lifespan of Micro LED displays. The embodiments of this application provide a built-in, actively compensated Micro LED display device and its manufacturing method. The core concept is to integrate a photodetector into each light-emitting unit (sub-pixel) inside the display device, and form a closed-loop monitoring and feedback system with the corresponding driving pixel circuit. This system can realize in-situ acquisition of the actual brightness of the light-emitting layer and automatically adjust the driving signal in the test mode according to preset conditions, thereby achieving pixel-level, full life-cycle uniformity autonomous compensation.

[0025] The following embodiments will illustrate in detail the specific device structure, connection relationship and manufacturing process for realizing the above concept.

[0026] Please see Figure 1-2In one embodiment, the Micro LED display device includes a control circuit layer 100, LED pixels 200 disposed on the control circuit layer 100, and a detector 300 disposed within the LED pixels 200. The LED pixels 200 are self-emissive under current drive, the detector 300 is used to collect the actual light emission of the LED pixels 200, and the control circuit layer 100 is used to control the brightness of the LED pixels 200 based on the signal detected by the detector 300.

[0027] In one embodiment, the LED pixels 200 are arranged in an array. An array refers to multiple photoelectric devices with the same function (such as multiple miniature light-emitting diodes or photodetectors) arranged in a preset, regular geometric pattern (such as a matrix) within a single device layer plane. In specific implementation, for example, a standard spacing is used for layout to accurately match the needs of multi-pixel display. A number of pixel circuits 101 are correspondingly provided in the control circuit layer 100, and each pixel circuit 101 controls one LED pixel 200.

[0028] Please see Figure 2 In one embodiment, each LED pixel 200 includes a first color emitting layer 220 and a light-transmitting layer 210 stacked on the first color emitting layer 220. The emitting layer refers to a complete electroluminescent unit comprising two electrode layers and an active layer sandwiched between the two electrode layers. The light-transmitting layer 210 is a dielectric layer covering the light emission path of the emitting layer, and its function is to protect the emitting layer, perform optical modulation (such as improving light extraction efficiency), and provide a carrier for integrating other functional components.

[0029] The detector 300 includes a first color detector 310, which is disposed on the light-transmitting layer 210 and is used to collect the actual luminous intensity of the first color emitting layer 220.

[0030] Pixel circuit 101 includes a first pixel circuit, which is electrically connected to the first color emitting layer 220 and the first color detector 310. The first pixel circuit drives the first color emitting layer 220 to emit light. In test mode, it determines whether the emitting condition of the first color emitting layer 220 meets the preset adjustment conditions based on the actual emitting brightness collected by the first color detector 310, and maintains or adjusts the magnitude of the driving electrical signal applied to the first color emitting layer 220 according to the determination result. The first pixel circuit typically integrates a driving unit and a control unit. The driving unit simply provides the driving electrical signal and may consist of a driving transistor and its related control switches. The control unit is used to determine and calculate, and outputs the calculation result to the driving unit. The control unit may include an analog comparator, an analog-to-digital converter (ADC), and simple digital logic. The pixel circuit 101 is implemented by using standard CMOS technology to fabricate an application-specific integrated circuit (ASIC) containing the above functions on a silicon substrate, establishing an independent, closed-loop "drive-calculation-feedback" control loop for each emitting unit.

[0031] Understandably, in one embodiment, the size of the first color detector 310 occupies only 3% of the size of the light-transmitting layer 210, thereby allowing the light emitted by the first color emitting layer 220 to pass through the first color detector 310 with minimal loss for display. In other embodiments, the size of the first color detector 310 can be controlled to occupy 1%-10% of the size of the light-transmitting layer 210, thereby avoiding the setting of the first color detector 310 from affecting the light emission display of the first color emitting layer 220. From a practical implementation perspective, by controlling the device layout design and fabrication process, for a MicroLED pixel with a size on the micrometer scale, the size of its integrated detector 300 is correspondingly on the submicrometer to several micrometer scale. To minimize the obstruction and interference of the detector 300 itself on the display light path, since the detector 300 is physically located in the light-emitting path of the light-emitting layer (such as being placed in the light-transmitting layer 210), if its area is too large, it will become an opaque obstacle, excessively blocking light, resulting in a decrease in the overall brightness of the display screen, damage to the light transmittance, and possible generation of fixed light and dark patterns (i.e., a new "Mura" introduced by the detector 300 array itself). By limiting the area to a small percentage, it is ensured that the light from most of the light-emitting area can pass through unobstructed, thereby ensuring the optical efficiency and uniformity of the display.

[0032] Please see Figure 3 In practical applications, when the Micro LED display device of this concept exhibits the mura phenomenon, the brightness can be adjusted according to the following steps: S1. In test mode, the first pixel circuit applies an initial driving electrical signal to the first color light-emitting layer 220, causing the first color light-emitting layer 220 to emit light. S2. The first color detector 310 receives the light emitted by the first color light-emitting layer 220, performs photoelectric conversion, generates an actual light emission brightness signal, and outputs it. S3. The first pixel circuit receives the actual luminous intensity signal output by the first color detector 310 and determines whether the luminous status of the first color luminous layer 220 of the LED pixel 200 meets the preset adjustment conditions based on the actual luminous intensity signal. S4. For the first color emitting layer 220 that has reached the preset adjustment condition as determined by step S3, the first pixel circuit adjusts the magnitude of the driving electrical signal applied to the first color emitting layer 220 so that the first color emitting layer 220 no longer meets the preset adjustment condition. For the first color emitting layer 220 that has not reached the preset adjustment condition as determined by step S3, the first pixel circuit maintains the value of the driving electrical signal as the value of the initial electrical signal.

[0033] In step S1, the driving electrical signal can be provided by the driving transistor and its related control switch that may be included in the pixel unit. In step S3, the judgment step can be implemented by the analog comparator, analog-to-digital converter (ADC) and simple digital logic part that may be included in the pixel unit. In step S4, the adjustment method can be to change the amplitude of the data voltage (Vdata) of the driving transistor, that is, to adjust the amplitude of the driving current (PAM), or to adjust the pulse width of the light emission (PWM).

[0034] It is understandable that the preset adjustment condition refers to the inconsistency between the actual luminous brightness of the first color emitting layer 220 and the target brightness. Specifically, "determining whether the luminous condition of the first color emitting layer 220 meets the preset adjustment condition based on the actual luminous brightness signal" includes the following steps: comparing the actual luminous brightness of the first color emitting layer 220 with the target brightness. If the actual luminous brightness is consistent with the target brightness, it indicates that the luminous condition of the first color emitting layer 220 does not meet the preset adjustment condition and no adjustment is needed. If the actual luminous brightness is inconsistent with the target brightness, it indicates that the luminous condition of the first color emitting layer 220 meets the preset adjustment condition and adjustment is needed. It should be noted that consistency means that the deviation between the actual brightness signal and the target brightness signal does not exceed the acceptable tolerance range; that is, the actual brightness signal and the target brightness signal are not required to be exactly the same, and tolerance is allowed.

[0035] The target brightness can be a fixed value preset in the first pixel circuit, or it can be an average value calculated by the control circuit layer 100 based on the actual light emission of the multiple first color light-emitting layers 220. That is, the target brightness is set to make the brightness of each first color light-emitting layer 220 on the adjusted display device uniform, rather than necessarily reaching a certain fixed brightness.

[0036] The Micro-LED display device of this embodiment, by placing the first color detector 310 on the light-transmitting layer 210, not only enables the display device to perform demura operation on its own, but also reduces the size of the display device in both the horizontal and vertical directions, which is beneficial to the miniaturization of the display device.

[0037] Please see Figure 4 In one embodiment, each LED pixel 200 includes a second color light-emitting layer 230, a first color light-emitting layer 220, and a light-transmitting layer 210 stacked on the pixel circuit 101 in the following order.

[0038] The light emitted by the first color emitting layer 220 and the second color emitting layer 230 is of different colors.

[0039] The detector 300 includes a first color detector 310 and a second color detector 320. The first color detector 310 is disposed on the light-transmitting layer 210 and is used to collect the actual luminous brightness of the first color luminous layer 220. The second color detector 320 is disposed on the first color luminous layer 220 and is used to collect the actual luminous brightness of the second color luminous layer 230.

[0040] The pixel circuit 101 includes a first pixel circuit and a second pixel circuit. The first pixel circuit is electrically connected to the first light-emitting layer 220 and the first color detector 310. The first pixel circuit is used to drive the first color light-emitting layer 220 to emit light. In test mode, it determines whether the emitting condition of the first color light-emitting layer 220 meets the preset adjustment conditions based on the actual emitting brightness collected by the first color detector 310, and maintains or adjusts the magnitude of the driving electrical signal applied to the first color light-emitting layer 220 according to the determination result. The second pixel circuit is electrically connected to the second color light-emitting layer 230 and the second color detector 320. The second pixel circuit is used to drive the second color light-emitting layer 230 to emit light. In test mode, it determines whether the emitting condition of the second color light-emitting layer 230 meets the preset adjustment conditions based on the actual emitting brightness collected by the second color detector 320, and maintains or adjusts the magnitude of the driving electrical signal applied to the second color light-emitting layer 230 according to the determination result.

[0041] Understandably, in one embodiment, the size of the second color detector 320 is only 3% of the size of the first color emitting layer 220, thereby allowing the light emitted by the second color emitting layer 230 to pass through the second color detector 320 with minimal loss for display. In other embodiments, the size of the second color detector 320 can be controlled to be 1%-10% of the size of the first color emitting layer 220, thereby avoiding the setting of the second color detector 320 from affecting the light emission display of the first color emitting layer 220 and the second color emitting layer 230.

[0042] It is understood that, in one embodiment, the projections of the first color detector 310 and the second color detector 320 onto the control circuit layer 100 do not overlap.

[0043] In practical applications, when the Micro LED display device of this concept exhibits the mura phenomenon, the brightness can be adjusted according to the following steps: S1. In test mode, the first pixel circuit applies an initial driving electrical signal to the first color light-emitting layer 220, causing the first color light-emitting layer 220 to emit light; the second pixel circuit applies an initial driving electrical signal to the second color light-emitting layer 230, causing the second color light-emitting layer 230 to emit light. S2. The first color detector 310 receives the light emitted by the first color light-emitting layer 220, performs photoelectric conversion, generates an actual light emission brightness signal, and outputs it; the second color detector 320 receives the light emitted by the second color light-emitting layer 230, performs photoelectric conversion, generates an actual light emission brightness signal, and outputs it. S3. The first pixel circuit receives the actual luminous intensity signal output by the first color detector 310 and determines whether the luminous condition of the first color luminous layer 220 of the LED pixel 200 meets the preset adjustment conditions based on the actual luminous intensity signal; the second pixel circuit receives the actual luminous intensity signal output by the second color detector 320 and determines whether the luminous condition of the second color luminous layer 230 of the LED pixel 200 meets the preset adjustment conditions based on the actual luminous intensity signal. S4. Brightness Adjustment: For the first color emitting layer 220 that is determined to meet the preset adjustment conditions in step S3, the first pixel circuit adjusts the magnitude of the driving electrical signal applied to the first color emitting layer 220 so that the first color emitting layer 220 no longer meets the preset adjustment conditions. For the first color emitting layer 220 that is determined not to meet the preset adjustment conditions in step S3, the first pixel circuit maintains the value of the driving electrical signal at the value of the initial electrical signal. For the second color emitting layer 230 that is determined to meet the preset adjustment conditions in step S3, the second pixel circuit adjusts the magnitude of the driving electrical signal applied to the second color emitting layer 230 so that the second color emitting layer 230 no longer meets the preset adjustment conditions. For the second color emitting layer 230 that is determined not to meet the preset adjustment conditions in step S3, the second pixel circuit maintains the value of the driving electrical signal at the value of the initial electrical signal.

[0044] It is understood that when the Micro LED display device of this embodiment exhibits a demura display, the demura can be achieved by controlling only the first color light-emitting layer 220 or the second color light-emitting layer 230 to emit light through the driving circuit layer, or by controlling both the first color light-emitting layer 220 and the second color light-emitting layer 230 to emit light through the driving circuit layer, thereby achieving adjustment of the color uniformity of the partial color display.

[0045] Please see Figure 5 ,exist Figure 5 In the Micro LED display device shown, with Figure 4 Compared to the Micro LED display device shown, each LED pixel 200 further includes a third color emitting layer 240, which is located between the control circuit layer 100 and the second color emitting layer 230. The detector 300 also includes a third color detector 330, which is located on the second color emitting layer 230 to collect the actual luminous intensity of the third color emitting layer 240. The pixel circuit 101 also includes a third pixel circuit, which is electrically connected to both the third color emitting layer 240 and the third color detector 330. The third pixel circuit is used to drive the third color emitting layer 240 to emit light. In test mode, it determines whether the luminous intensity of the third color emitting layer 240 meets the preset adjustment conditions based on the actual luminous intensity collected by the third color detector 330, and maintains or adjusts the magnitude of the driving electrical signal applied to the third color emitting layer 240 according to the determination result.

[0046] In practical applications, when the display effect of this Micro LED display device needs to be adjusted, the following steps can be taken: In test mode, the control circuit layer 100 applies initial driving signals to the first color light-emitting layer 220, the second color light-emitting layer 230 and the third color light-emitting layer 240 respectively to drive them to emit light. The first color detector 310, the second color detector 320, and the third color detector 330 respectively detect the actual luminous brightness signals of the first color luminous layer 220, the second color luminous layer 230, and the third color luminous layer 240. The control circuit layer 100 determines whether the luminescence of the first color luminescent layer 220, the second color luminescent layer, and the third color luminescent layer meets the preset adjustment conditions. The control circuit layer 100 controls the driving electrical signals applied to the first color light-emitting layer 220, the second color light-emitting layer 230 and the third color light-emitting layer 240 respectively, so that the first color light-emitting layer 220, the second color light-emitting layer 230 and the third color light-emitting layer 240 do not meet the preset adjustment conditions.

[0047] The specific principles of each step are the same as those in the aforementioned embodiments, and will not be repeated here.

[0048] In one embodiment, the size of the third color detector 330 is only 3% of the size of the second color emitting layer 230, thereby allowing the light emitted by the third color emitting layer 240 to pass through the third color detector 330 with minimal loss for display. In other embodiments, the size of the third color detector 330 can be controlled to be 1%-10% of the size of the second color emitting layer 230, thereby avoiding the arrangement of the third color detector 330 from affecting the light emission display of both the third color emitting layer 240 and the second color emitting layer 230.

[0049] In one embodiment, the projections of the first color detector 310, the second color detector 320, and the third color detector 330 onto the control circuit layer 100 do not overlap.

[0050] It is understandable that the specific colors of the first color emitting layer 220, the second color emitting layer 230, and the third color emitting layer 240 are not limited, but preferably they are one of red, green, and blue respectively, so that the LED pixel 200 is a full-color pixel. Different colors can be displayed by adjusting the brightness ratio of the first color emitting layer 220, the second color emitting layer 230, and the third color emitting layer 240. At this time, the color display uniformity of the display device can also be adjusted by adjusting the actual luminous brightness of each emitting layer.

[0051] This application also provides a display screen comprising at least two Micro LED display devices described in the foregoing embodiments. The display screen can be a television display screen, a computer display screen, or a vehicle display screen, etc., and its specific type is not limited. The display screen is composed of at least two Micro LED display devices provided in this concept, and the specific number of devices spliced ​​can be determined according to the size of the display screen and the Micro LED display devices. The specific splicing process is consistent with the prior art and will not be described in detail here.

[0052] The display screen provided in this application is assembled by using display devices that can perform self-demonstration at the pixel level, which makes the display brightness and color uniformity adjustable, thereby extending the service life to a certain extent.

[0053] The above is only one specific implementation of this application, and any other improvements made based on the concept of this application shall be considered within the scope of protection of this application.

Claims

1. A Micro LED display device, characterized in that, This includes the control circuit layer, LED pixels, and detectors; The LED pixel is located on the control circuit layer and includes a first color light-emitting layer and a light-transmitting layer stacked on the first color light-emitting layer. The light-transmitting layer is located on the light-emitting path of the first color light-emitting layer. The detector includes a first color detector, which is disposed on the light-transmitting layer and located within the LED pixel, and is used to collect the actual luminous brightness of the first color luminous layer. The control circuit layer is provided with a number of pixel circuits, each pixel circuit corresponding to control one LED pixel. The pixel circuit includes a first pixel circuit, which is electrically connected to the first color emitting layer and the first color detector. The first pixel circuit is used to drive the first color emitting layer to emit light. In test mode, it determines whether the emitting condition of the first color emitting layer has reached the preset adjustment condition based on the actual emitting brightness collected by the first color detector, and maintains or adjusts the magnitude of the driving electrical signal applied to the first color emitting layer according to the judgment result.

2. The Micro LED display device according to claim 1, characterized in that, The LED pixel further includes a second color emitting layer, which is located between the first color emitting layer and the control circuit layer. The detector further includes a second color detector, which is located on the first color emitting layer to collect the actual luminous intensity of the second color emitting layer. Both the second color emitting layer and the second color detector are connected to the control circuit layer.

3. The Micro LED display device according to claim 2, characterized in that, The LED pixel further includes a third color emitting layer, which is located between the second color emitting layer and the control circuit layer. The detector further includes a third color detector, which is located on the second color emitting layer to collect the actual luminous intensity of the third color emitting layer. Both the third color emitting layer and the third color detector are connected to the control circuit layer.

4. The Micro LED display device according to claim 3, characterized in that, The projections of the first color detector, the second color detector, and the third color detector on the control circuit layer are staggered.

5. The Micro LED display device according to claim 3, characterized in that, The area of ​​the first color detector accounts for 1%-10% of the area of ​​the light-transmitting layer; and / or, The area of ​​the second color detector is 1%-10% of the area of ​​the first color emitting layer; and / or, The area of ​​the third color detector accounts for 1%-10% of the area of ​​the second color emitting layer.

6. The Micro LED display device according to claim 3, characterized in that, The first color emitting layer, the second color emitting layer, and the third color emitting layer are respectively selected from one of the red light emitting layer, the green light emitting layer, and the blue light emitting layer, and the first color emitting layer, the second color emitting layer, and the third color emitting layer are displayed in different colors.

7. The Micro LED display device according to any one of claims 1-6, characterized in that, The LED pixels are arranged in an array in the Micro LED display device.

8. A brightness control method for a Micro LED display device as described in any one of claims 1-7, characterized in that, Includes the following steps: In test mode, the control circuit layer applies an initial drive signal to drive the LED pixels to emit light; The detector receives light and performs photoelectric conversion to generate and output the actual luminous intensity signal. The control circuit layer receives the actual luminous intensity signal output by the detector and determines whether the luminous status of the LED pixel meets the preset adjustment conditions based on the actual luminous intensity signal. For LED pixels that meet the preset adjustment conditions, the pixel circuit changes the magnitude of the driving electrical signal applied to the LED pixel so that the LED pixel no longer meets the preset adjustment conditions. For LED pixels that do not meet the preset adjustment conditions, the pixel circuit maintains the value of the driving electrical signal at the value of the initial driving electrical signal.

9. The brightness control method according to claim 8, characterized in that, The LED pixel includes a first color emissive layer, a second color emissive layer, and a third color emissive layer; the detector includes a first color detector, a second color detector, and a third color detector; and the brightness control method includes the following steps: In test mode, the control circuit layer applies initial driving signals to the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer respectively to drive them to emit light; The first color detector, the second color detector, and the third color detector respectively detect the actual luminous brightness signals of the first color luminous layer, the second color luminous layer, and the third color luminous layer; The control circuit layer determines whether the luminescence of the first color emitting layer, the second color emitting layer, and the third color emitting layer meets the preset adjustment conditions. The control circuit layer controls the driving electrical signals applied to the first color light-emitting layer, the second color light-emitting layer, and the third color light-emitting layer respectively, so that the first color light-emitting layer, the second color light-emitting layer, and the third color light-emitting layer do not meet the preset adjustment conditions.

10. A display screen, characterized in that, The display screen includes at least two Micro LED display devices as described in any one of claims 1-7.

Images